Inside the often-chaotic NFL challenge process

Kansas City Chiefs receiver Marquez Valdes-Scantling, while in the grasp of two Cincinnati Bengals defenders Sunday, extended his right arm while holding the ball in hopes of gaining the extra half-yard necessary for a key first down.

There was 6:07 remaining in the third quarter of a tied AFC Championship Game and the spot was ruled short, which meant fourth-and-1 from the Bengals' 20.

Chiefs coach Andy Reid faced a decision as critical as any he would make with a Super Bowl trip on the line, and he had seconds to make it. Should he challenge the spot, risking his second timeout knowing it was his last challenge with 21 minutes of action remaining, or move on to fourth down?

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"Unless it's egregious, they're going to go with the call," said former coach John Fox, who didn't like to challenge the spotting of the ball. "You ain't winning that."